Well I did a red ale/english IPA -ish recipe, with water from my well (sulfurous), amber LME, crystal 60, Nugget hops for about 30 IBU and dry hopping, and... over 50% of it derived from white table sugar (I meant to do like 30%, but... oops).
To me, the statement that over 10% sugar leaves a tasteless bland product has been debunked. While the first times I sampled it, prior to dry hopping, I was quite worried and did consider it tasted watered down, the final product does not at all taste that way. I would even say it has more (malt?) character that I'm used to, than typical american-style IPAs I typically drink.